I'm glad you're having this conversation as I'm wondering when to tell DS that he can expect a sibling. He's only 2.3 but rather handily he has been spending time with a childminder who is now very visibly pg. So we've talked about babies in tummies. And he saw a baby fox in our garden and told me he wants a fox in his tummy! 
I thought we might take him to the 12wk scan and then he can be part of the news from then on in. Does that sound sensible? If the scan is bad news he won't understand it anyway... Of course, I'm brooking that it won't come to that.
I love the fact our DC have opinions although of course I know this can be a little tiring at times.
Not long to your scan then State?
Smegs - great antibios have cleared up all sorts. Must be such a relief. I am enjoying plenty of greens and the usual amount of fruit but more likely to hanker after quite chunky food just had a veggie samosa straight after acupuncture, ravenous again and strong flavours. Not so bothered about sweet stuff. I think I was more sweet-toothed with DS.